单选题：Of all the careers he followed, his main concern was concent

题目分类：理工类
题目类型：单选题
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题目内容：

Of all the careers he followed, his main concern was concentrated on _________. A．A　building the sub-water labs
B．B　ocean and ocean pollution
C．C　making films and television programmes
D．D　writing encounters with sea animals, such as sharks

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